An article here on Kurt Tank:
https://nationalinterest.org/blog/th...-fighter-20871
The CIA had an interest and there are some references to some individuals if you look though the 4 page results of this search (Argentina and Luftwaffe). Not all hits are relevant. There may be some better search terms to use:
https://www.cia.gov/library/readingr...20%20Luftwaffe
Here are the results when for searching for Rudel Luftwaffe
https://www.cia.gov/library/readingr...20%20Luftwaffe
Note how the results on Rudel seem to be broken into a series of pdf pages. For example, the 3rd item listed ends in 0005:
https://www.cia.gov/library/readingr...0HANS_0005.pdf
Note both General Galland and Oberst Baumbach are mentioned, Baumbach is probably this man:
https://en.wikipedia.org/wiki/Werner_Baumbach
Just for fun, I changed the 0005 to 0004 and you get another piece:
https://www.cia.gov/library/readingr...0HANS_0004.pdf
and a mention of "Willy" Tank.